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What are the pump selection requirements, and the cause and troubleshooting of the XBD-W horizontal single-stage fire pump failure

2020-08-27
Pump is a wide range of general machinery equipment, it is widely used in petroleum, chemical industry, power metallurgy, mining, ship sorting, light industry, agriculture, civil and national defense departments, in the national economy occupies an important position. According to incomplete statistics in 79, China's pump output reached 1.256 million. The power consumption of the pump accounts for more than 21% of the national power consumption. Therefore, it is of great significance to reduce the energy consumption of the pump.

In recent years, the pump industry has designed and developed many high-efficiency and energy-saving products, such as IHF, CQB, FSB, UHB and other types of pump products, which play a positive role in reducing the energy consumption of the pump. However, in various fields of the national economy, due to unreasonable selection, many pumps are in unreasonable operating condition, low operating efficiency, and waste a lot of energy. Some pumps cannot be used at all due to the unreasonable type selection, or the use of maintenance costs increase, low economic benefits. It can be seen that the reasonable selection of pumps to save energy is also of great significance.

The so-called reasonable pump selection, is to consider the pump unit and pump station investment and operating costs and other comprehensive technical and economic indicators, so that it conforms to the principles of economy, safety, and application. Specifically, there are the following aspects:

1, must meet the use of flow and head requirements, that is, the requirements of the pump operation point (device characteristic curve and pump performance curve intersection point) often keep in the high efficiency interval operation, so as to save power and not easy to damage the parts.

2, the selected pump should be small in size, light in weight, cheap in cost, but also have good characteristics and high efficiency.

3. It has good cavitation resistance, which can not only reduce the excavation depth of the pump room, but also prevent cavitation of the pump, so that the operation is stable and the life is long.

4, according to the selected pump pump station, the project investment is small, low operating costs.

steps

1, the characteristics of the medium: the name of the medium, specific gravity, viscosity, corrosion, toxicity, etc.

2. The particle diameter and content of the cause body contained in the medium.

3. Temperature of medium :(℃)

4. Required flow

The leakage in the pipeline system can be ignored in the process flow of industrial pumps, but the influence of process changes on the flow rate must be considered. Agricultural pump if the use of open channels to carry water, but also must consider leakage and evaporation.

5. Pressure: suction pool pressure, drainage pool pressure, pressure drop in pipeline system (head loss).

6. Piping system data (pipe diameter, length, type and number of piping accessories, geometric elevation of suction pool to pressure pool, etc.).

1. Determination of flow

A. If a small, normal or large flow rate has been given in the production process, it should be considered as large flow rate.

B. If only the normal flow rate is given in the production process, a certain margin should be considered.

For the unintended lift pump of ns>100 with large flow and low flow, the flow margin should be 5%; for the pump with high and low flow of ns<50, the flow margin should be 10%; for the pump with 50≤ns≤100, the flow margin should also be 5%; for the pump with poor quality and bad operating conditions, the flow margin should be 10%.

C. If the basic data is given only by weight flow, it should be converted to volume flow.